GSAK (Geocaching Swiss Army Knife)
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VarExists (function)

VarExists(sVarName) : Boolean

VarExists() enables you to test for the existence of a variable. Use when you want to know if a variable has already been created or not . Remove the leading $ when passing the variable name to check.

$test = "abc"
If VarExists("test")
MsgOk Msg="Variable exists"

Also see the RemoveVar() function
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